Revolving chair



(No'ModeH 1?. D. KRAMER 8: G. LOUYS'; REVOLVING CHAIR.

, y Vga-@WS MKM ` the seat itself, and betweenthis seat-frame 'and the top of the standard A is interposed `UNITED STATES PATENT OFFICE.

FRANCIS D. KRAMER AND GEORGE LOUYS, OF PHILADELPHIA,

PENNSYLVANIA REvoLvrlNc CHAIR.

SPECIFICATION forming part of Letters Patent No. 412,513, dated October 8, 1889.

Application filed November 15, 1888. Serial No. 290,919. (No model.)

To all whom it may concern: v

Beit known that we, FRANCIS D. KRAMER and GEORGE LOUYS, both citizens of the United States, and residents of Philadelphia, Pennsylvania, have invented certain 11nprovements in Revolving Chairs, of which the following is a specification.

Our invention relates to that class of chairs in which the seat is capable of revolving on the base or standard, the object of our invention being to provide such a chair with simple and inexpensive means whereby such friction between the seat-frame and standard is insured as will prevent accidental movement of the seat in either direction.

In the accompanying drawings, Figure l is a vertical section of sufficient of the chair to illustrate our invention, and Fig. 2 is a sectional plan view on the line 1 2, Fig. l.

A represents the hollow standard of the chair, which is expanded at the base and provided with suitable openings ct-for the reception of the screws or other fastenings wherebyT said base is secured to the iioor.

The seat-frame B of the chair is constructed in any of the usual ways for the reception of a friction disk or washer D, the seat-frame B being secured to a central rod F by means of a transverse pin or key b. The friction-disk D is likewise secured to said central rod F by means of a transverse pin d, said disk having by preference a central hub or enlargement f for the reception of this pin. The lower end of the rod F passes througha cross-bar g near the bottom of thestandard, and is provided with nuts h below said crossbar, so that the seat can-not be lifted from the standard. Free to slide on the rod F above the cross-bar gis a collar G, which can be adjusted vertically upon the rod by the manipulation of nuts t', which support the collar and are adapted to the threaded lower portion of the rod F, as shown in Fig. l. Between the collar G and a cross-bar or partition fm in the hollow standard A is interposed a coiled spring J, the tendency`of which is to depress the collar -G and rod F, and thus maintain the disk D in intimate frictional contact with the upper end of the standard,

thereby preventing any swinging or turning of the chair on the standard, except when said chair is grasped and turned by hand.

By this means` we overcome a serious objec- 5 5' tion to ordinary swinging or revolving chairs when the latter are used on shipboard, as in s uch cases the movements of the vessel, when at sea, cause a continual swinging or turning of. the unoccupied chairs on their standards, 6o

and thus not only cause wear of the various parts, but add to that general sense of the instability of things which exists in the minds of most passengers.

The seat pin or key frame is secured to the upper end of the rod F, is such that it can be readily driven out, so that the seat can be applied to or removed from the standard without disturbing the friction-disk D, the rod F, or any other parts. 7o

In some cases, however, the friction-disk may form part of the seat-frame, although, for the reason above given, the construction shown is preferred.

I-Iaving thus described our invention, we

claim and desire to secure by Letters Patentl. The combination of the hollow standard having an internal bearing, the seat-rod carried within the standard and having a collar,

a spring interposed between said collar and 8o the bearing in the standard and serving to depress the rod, and a seat-frame and rigid friction-disk carried by the upper end of the rod, said friction-disk being seated upon the upper end of the standard and held in frictional contact therewith by the downward pressure of the spring, substantially as speciiied.

2. The combination of the hollow standard having an internal bearing, the seat-rod car- 9o ried within the standard and having a collar, a spring interposed between said collar and the bearing in the standard and serving to depress the rod, and a seat-frame and rigid frictiowdisk independent of each other and independently secured to the upper end of the seatfrod, said friction-disk being interposed between the seat-frame and the Lipper end of the standard and being held in frictional contact with the latter by the downward pressure roo of the spring, all substantially as specified.

3. The combinationvof the hollow standard b, whereby vthe seat- 65 having an internal bearing, the sent-rod cerried Within the stende-rd and having a collar, a spring interposed between said collar and the bearing in the standard and servingr to depress the rod, a seat-frame detztehably secured to the upper end of the rod,and a rigid friction-disk permanently secured to seid rod, interposed between the seat-frame and the standard, end held in frictional Contact with 10 the upper end of said standard by the down Werd pressure of the spring, all substantially as specified.

In testimony whereof We have signed our naines to this specification in the presence of two subscribing Witnesses.

FRANCIS D. KRAMER. GEORGE LOUYS. XVitnesses:

WILLIAM D. CoNNER, HARRY SMITH. 

